The Finite Element Analysis Of 37 Meter Truck-mounted Concrete Pump's Base Structure System And Structural Optimization Of Leg

With the rapid development of the economic construction and the continuous advancement of socialist modernization in China,the truck-mounted concrete pump plays an irreplaceable role in the national infrastructure construction due to its high flexibility and reliability.Nowadays,domestic manufacturers continue to break the world record in terms of boom length and pumping displacement.However,the base structure system as the main loading-bearing structure of most models lacks static analysis under all working conditions when designing,and is limited to one or several special operating conditions.In addition,the design of the thickness of each component is conservative,which will inevitably reduce the market competitiveness of the product and increase production cost.In this paper,the research object is the base structure system of the HB37 two bridge truck-mounted concrete pump,which is designed and manufactured by XCMG Schweiying Machinery Co.,Ltd.The purpose is to improve the market competitiveness of product and reduce manufacturing cost.First,find the dangerous working condition and the dangerous points of each component by establishing the finite element model and calculating all working conditions.Then carry out the stress test of the outrigger structure.Finally,based on the results of finite element calculation and stress test data,the optimization of plate thickness of outrigger structure is completed.The tasks of the paper are as follows:(1)Using software to pre-process the model provided by the manufacturer,including extracting middle surface,geometric processing,grid partition and assigning material properties.And assembling the model by applying the program.Then selecting the appropriate position to build the contact pair,and applying the constraints and loads.(2)The finite element static calculation is carried out for the base structure system,the displacement and stress distribution of each component are analyzed in the process of slewing from 0° to 360° of the boom.The dangerous working conditions of each component are obtained,and the uneven stress area and dangerous position of each component are found.(3)Based on the field operation,the dynamic stress measurement experiment of the outrigger structure is carried out to verify the correctness of the calculation method of the base structure system.(4)Separating the rear outrigger structure,combined with the calculation and test results,the plate thickness optimization of the outrigger structure is completed.After analysis and research,the stiffness,strength and stability of HB 37 truck-mounted concrete pump's base structure system are verified.The finite element method has been proved correct and the lightweight design of the leg structure has been realized.At the same time,this paper provides a theoretical basis for the design and the study of the dynamic characteristics of the base structure system.It also provides a reference calculation and analysis method for other similar models.